Note: I use the same IP address for both connections, I prefer to use wireless and only use it with the network cable disconnected. When I use the ethernet controller I disable the wireless card from a hardware switch on the side of the laptop.

Is your wireless network unencrypted, WEP-encrypted or WPA-encrypted? If it is an encrypted network, is your router configured to hide the network SSID (network name)? If it is, configure your router to unhide the network so that NetworkManager can discover the network. You can then configure the router to hide it again (although it's a waste of time, as it is possible to detect networks that hide the SSID anyway*). See the post Two Issues: Can't connect to WPA network. Dual boot WinXP. and the one following it.

* According to NetworkManager developer Dan Williams:

Hiding isn't actually a useful method of increasing security, since the
AP's beacon and BSSID are always available in probe responses; so anyone
can actually get the SSID irregardless of whether the AP is broadcasting
that information in its beacon.

- First post was about not being able to connect to the network, I can successfully connect, the kdenetwokrmanager shows the connection as active and I got my wlan0 interface UP as shown on the "ifconfig -a" that I posted.

The network is WEP-Encrypted, but is not hiding the network name.

-Second post was about a browser not working, but the user could ping to his router and even google. I can't even ping to my router, as shown on the post.

I think it's something about the autoconfiguration kdenetworkmanager does... Will try to set up manually and see what happens.

Try using Wicd instead of NetworkManager if you're using a static IP address. It is possible to set up NetworkManager to use a static address, but no one using SL seems to have success with it (if you search the SL forums), whereas those who use Wicd seem to have no trouble. Replacing NetworkManager with Wicd is straightforward: see the SL wiki article HOWTO: Replace NM with WICD.